锚杆抗滑桩是滑(边)坡加固的重要措施之一,由于岩土体介质的特殊性,其桩身及锚杆的实际应力应变与理论计算存在较大差异,致使其破坏机理与监测预警一直是工程界关注的重点和难点。通过开展锚杆抗滑桩的物理模型试验,深入研究锚杆抗滑桩变形破坏的演化规律,采用数据分析、数学模型拟合等方法,得出了锚杆抗滑桩的安全预警判据,并对锚杆抗滑桩施工期和运营期的安全监测方案提出建议。研究表明:锚杆抗滑桩从开始变形直至最终破坏大致都要经历弹性变形、弹塑性变形、塑性变形3个阶段;锚杆抗滑桩治理滑坡时,应重点对抗滑桩的桩顶位移、桩身应力应变及锚杆锚固力进行监测;建立锚杆应力值与桩顶位移的关系,预测锚杆是否屈服,为锚杆抗滑桩的监测预警提供了具有借鉴意义的思路。
Anti-slide anchor pile is an important reinforcement measure for sliding (side) slope. The failure mechanism and monitoring warning have been the focus and difficulty of engineering because of big difference between the measured and theoretical values of pile and anchor’s stress and strain. By physical model tests on anchor piles,the evolution of anchor pile’s deformation and failure were analyzed. Data analysis,mathematical model fitting and other methods were adopted to obtain the safety early warning criterion for anti-slide anchor pile. Suggestions for safety monitoring during anchor pile’s construction and operation were proposed. Results show that anchor piles generally go through three stages,namely elastic deformation,elasto-plastic deformation,and plastic deformation from the beginning until the final destruction. Monitoring on the pile top displacement,pile’s strain and stress,and anchor force should be emphasized. The relationship between anchor bolt stress value and pile top displacement should be obtained to predict the yielding of anchor bolt.
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